ABBREVIATION for
in Britain private branch exchange; a telephone system that handles the internal and external calls of a building, firm, etc (英国)用户交换机
Renert says Tello works with products from Cisco Systems and Avaya, makers of traditional private branch exchanges (PBXs), plus Digium, an open-source PBX software company.
Using software you install on your PC, you can take complete control over all the phones in the house and turn your internal phone network into a system like a private branch exchange (PBX) not unlike what you might find at the office.